Thomas s



dui-ted mes latent @tif-tire.'

THOMAS s. BROWN, OF POUeHKnEPslE; NEW YORK.,

Letters Patent No. 101,426, dated Apr/l 5, 1870.

. IMPROVEMENT IN MASK-GUIDES..

The Schedule referred to in these Letters Patent and making part of theIlma lowing is a full, clear, and exact description thereof,-.

which will enable lothers skilled in the art to make and use' the same,reference being had to the accompanying drawing forming part of thisspecification.

This invention relates to a new and useful improvement in mode ofguiding the parts copeand nowel) of a. foundry-flask together; andconsists in a triangular Or polygonal guide-pin, tapering on one side,and acted upon by a spring, so that the cope may be kept perfectlysteady and closed back on to the nowel in the exact position it occupiedwhen the pat-tern was molded, as will be hereinafter more fullydescribed.

In the accompanying drawing- Figure 1 is a view of the part which isfastened to the lower part, or nowel of the flask, showing the springand bolt.

Figure 2 is a side view of the two parts placed together as when in use,thezspring being shown iudotted lines, and the part covering the springbolt being broken away to s how the head of the bolt.

Similar letters of reference indicate corresponding parts.

A is the part which isfasteued to the lower part of V the flask.

B is the upper part. C is thc guide-pin, which is designed vto be triangular in form, with one side (bearing against the spring bolt) tapering,as seen in fig. 2.

.The other sides are designed to be straight, excepting at or near theend, so that when the pin has entered the hole in the projecting 'ilangeof A it will be guided down perpendicularly when the flask is closed. Dis a spring bolt, the 4head of which bears against the tapering side ofthe pin, and keeps the back or straight portion of the pin against thebaekportion of the hole.

E is a spiral spring around the bolt.

The pressure of the spring prevent-s any trembling or vibration, andallows the cope to descend to the exact position from which it wastaken.

.I do not confine myself' t9 the particular arrangement shown as regardsthe spring and bolt, vas I am aware that the same or a similar resultmay be produced by a spring operating in a different manner.

Having thus described my invention,

I claim as `new and desire to secure by Letters Patent*- A guide-plate,A, for flasks, provided with a spring bolt, D, whereby the guide-piuisoperated upon, in

THOS. S. BROWN.

- the manner described.

Vitnesses ROBT. N. lALMnn, WM. MOLEARY. s

